2. k : Knd
3. l : IdLnk
4. ds : x:Id fp-> Type
5. da : a:Knd fp-> Type
6. f : (tg:Id
State(ds)
ma-valtype(da; k)(da(rcv(l; tg))?Void List)) List
7. source(l) = i
8. w : World
9. FairFifo
10. FairFifo
11.
l@0:IdLnk, tg:Id.
11. (w.M(l@0,tg))
r if eqof(IdDeq)(source(l@0),i)
11. (w.M(l@0,tg))
r if <ds,da,,,,<[<k,l>],
x.f>,,,
>
11. (w.M(l@0,tg))
r else fi.da(rcv(l@0; tg))
12.
a:Action(i). 
isnull(a) 
(valtype(i;a) r da(kind(a))?Top)
13.
x:Id.
13. vartype(i;x)
r if deq-member(IdDeq;x;1of(ds)) 2of(ds)(x) else Top fi
14. e : E
15. isrcv(kind(e))
16. lnk(kind(e)) = l
17. isrcv(kind(e))
18. (w.M(lnk(kind(e)),tag(kind(e))))
r da(rcv(lnk(kind(e)); tag(kind(e))))?Top
19. source(lnk(kind(e))) = i
kind(e) = rcv(lnk(kind(e)); tag(kind(e)))
